Avoid Gradle deprecation warnings

After the upgrade to Gradle 9.6.0/9.6.1, the Gradle build started
emitting warnings due to use of deprecated APIs.

For example, Project.getProperties() is now annotated as @⁠Deprecated
in Gradle 9.6 and will be removed in Gradle 10.0.

To avoid the warnings, this commit modifies:

- TestConventions to use `project.findProperty(...)` instead of
  `project.getProperties().get(...)`

- framework-api.gradle to use `rootProject.ext.moduleProjects` instead
  of simply `moduleProjects`

- framework-api.gradle and framework-bom.gradle to use
  `project(<projectX>)` instead of simply `<projectX>`

- ide.gradle so that it no longer uses the deprecated `javaRuntimeName`

See gh-36952

gradle/ide.gradle

@@ -7,7 +7,6 @@ apply plugin: 'eclipse'
 eclipse.jdt {
 	sourceCompatibility = 17
 	targetCompatibility = 17
-	javaRuntimeName = "JavaSE-17"
 }
 
 // Replace classpath entries with project dependencies (GRADLE-1116)